RIB MOUNTAIN — A driver suffering a medical problem sparked a chain of events Wednesday in Rib Mountain that started with a two-vehicle crash and ended with a sheriff's deputy intentionally forcing a woman's car off the road, police said.

The Marathon County Sheriff's Department received a call at 2:23 p.m. Wednesday about a hit-and-run crash involving an injury on Rib Mountain Drive at Cloverland Drive, according to the department.

A deputy was unable to get the vehicle's driver to pull over, so the deputy used his squad car to safely guide the other vehicle to a stop in a ditch.

The deputy determined the driver, a 77-year-old woman, was experiencing a serious medical problem that had started before the initial crash; she was taken to Aspirus Wausau Hospital. Her condition isn't known.

The other driver involved in the initial crash, a 57-year-old man, suffered minor injuries but was not transported to the hospital, the department said.

The woman was cited for failure to stop for a red light and hit and run causing injury, police said.

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